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Ecological impact of a dam on benthic macroinvertebrates in montane rivers of lower Silesia

Rybak J., Sadłek W.

Environment Protection Engineering

2010

Vol. 36, nr 2

143-151

The ecological impact of dams on benthic macroinvertebrates found in three small montane rivers in south-western Poland was assessed. The macroinvertebrates lived in upstream and downstream zones as well as in the river free of any anthropogenic impact. We sampled 14 543 macroinvertebrate individuals in order to show how they respond to an impounding reservoir. We employed biotic indices (BMWP-PL, ASPT) to prove their usefulness as the indicators of anthropogenic perturbation. The diversity of macroinvertebrate species above dams and in the "natural" river was significantly higher than below dams. The chironomids and dipterans dominated downstream. However, the density of Ephemeroptera, Trichoptera and Crustacea was significantly reduced downstream. The analysis of Simpson's diversity index also proved the above results.